Crank assembly



FIG. 1 is a front elevated isometric view of my design;

FIG. 2 is a rear bottom isometric view of my design;

FIG. 3 is a front side view of my design;

FIG. 4 is a rear side view of my design;

FIG. 5 is a right side view of my design;

FIG. 6 is a left side view of my design;

FIG. 7 is a top view of my design; and,

FIG. 8 is a bottom view of my design.

The broken lines shown in the drawings are included for the purpose of illustrating an environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a crank assembly, substantially as shown as described. 